Iem 1101 Ch2 (Socket Outlet_edit)

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IEM1101 ELECTRICAL MULTITASKING

FOR INSTRUMENTATION


IEM1101 Chapter 2

SOCKET OUTLET


LEARNING OBJECTIVES

• At the end of the session, trainees will be able to: a) Identify different types of socket outlets used in

domestic and industrial installation.

b) Perform wiring of a BS 1363 plug and socket outlet.

c) Identify the difference between A1 ring circuit, A2 radial circuit and A3 radial circuit.

d) Perform testing and maintenance of power socket outlets.





1. INTRODUCTION

2. DOMESTIC SOCKET OUTLET

3. INDUSTRIAL SOCKET OUTLETS

4. SOCKET OUTLET CIRCUIT

5. TYPES OF CIRCUIT

6. SPURS

7. TESTING OF SOCKET OUTLET


INTRODUCTION

• Socket outlets

– to connect power supply to the load.

– to provide a means of manually remove and connect their appliance.

– can be switched or un-switched.





1. INTRODUCTION




5. TYPES OF CIRCUIT

6. SPURS



DOMESTIC SOCKET OUTLET

• Loads are connected to individual final circuits inside a DB.

• Each of the final circuits will deliver power to lighting circuits, motor circuits and socket outlet circuits.

• Plug and socket outlets are used to connect our daily loads to the final loads.



• BS 1363 socket

– Socket for the fused 13 A rectangular pin plug.

– Widely in domestic and commercial installation in Malaysia.

– The maximum rated - 240 V, 3 kW.

– Suitable for AC supply only.



13 A Socket outlet with plug



• BS 1363 plug

—Plug pins are solid rectangular pins

—Marked with L, N and E

—13 A fuse (BS 1362) connected between the live terminal and the connection point for the live cable.

—No BS 1363 plug with no fuse fitted

—Fuse for appliance’s protection



The internal wiring diagram of a BS 1363 plug



• Socket outlets and plugs

– Switched or un-switched version

– Provide AC supply for domestic installation with rated values of 2 A, 5 A, 13 A and 15 A.

2A socket outlet with plugs and 5A socket outlet with plugs



15 A Socket Outlet and Plug

5 A Socket Outlet and Plug





1. INTRODUCTION




5. TYPES OF CIRCUIT

6. SPURS



INDUSTRIAL SOCKET OUTLET

• BS 196 – Two-pin, non-reversible, with a scraping earth

connection.

– The fuse in the plug - can apply to either pole, or unfused.

– Interchangeability - is prevented by a keyway which may have any of eighteen different positions.

– Available with current ratings of 5 A, 15 A and 30 A.



• IBS EN 60309-2

– For industrial application

– Rated at 16A, 30A, 32A, 63A and 125 A.



BS EN 60309-2 Industrial Plug and Socket

BS 196 Industrial Pin


SOCKET OUTLET

• Important Points a) All socket outlets in one room must be connected with

the same phase. b) If it is not possible to do so, then the socket outlets must

be grouped together within the same phase. c) The minimum distance between socket outlets from

different phase should be 2 m. d) In order to avoid the socket outlets from being damaged

by cleaning machines, etc., the recommended minimum mounting height is 150 mm above working area.

e) Socket outlets in kitchen area must be covered with lid cover to avoid the sockets from being exposed to splash water.


SOCKET OUTLET

Basic Requirement of Socket Outlet installation





1. INTRODUCTION




5. TYPES OF CIRCUIT

6. SPURS



SOCKET OUTLET CIRCUIT

• The final circuits for 13 A socket outlets fitted with fused plug can be divided into three categories, which are:

a) A1 Ring circuit

b) A2 Radial circuit

c) A3 Radial circuit


SOCKET OUTLET CIRCUIT – RADIAL CIRCUIT

Radial Circuit


SOCKET OUTLET CIRCUIT – RING CIRCUIT

Ring Circuit





1. INTRODUCTION




5. TYPES OF CIRCUIT

6. SPURS



TYPES OF CIRCUIT – A1 RING CIRCUIT

• Requirements

a) Maximum floor area of 100 m2

b) Circuit protection by 30 A or 32 A fuse or MCB

c) The minimum conductor size will 2.5 mm2 for PVC/PVC cable and 1.5 mm2 for MIMS cable.

d) No limit in number of socket outlets and fused spurs used.


TYPES OF CIRCUIT – A2 RADIAL CIRCUIT

• Requirements


b) Circuit protection by 30 A or 32 A fuse or MCB

c) The minimum conductor size will 4 mm2 for PVC/PVC cable and 2.5 mm2 for MIMS cable.



TYPES OF CIRCUIT – A3 RADIAL CIRCUIT

• Requirements


b) Circuit protection by 20 A fuse or MCB

c) The minimum conductor size will 2.5 mm2 for PVC/PVC cable and 1.5 mm2 for MIMS cable.



TYPES OF CIRCUIT

Type of Circuit

Protective Device

Minimum Conductor (Copper conductor)

Rating PVC/PVC Mineral Insulated

Max. Floor

Area (m2)

A1 Ring 30/32 2.5 1.5 100

A2 Radial 30/32 4 2.5 50

A3 Radial 20 2.5 1.5 20





1. INTRODUCTION




5. TYPES OF CIRCUIT

6. SPURS



SPURS

• Used where a socket is required at a point away from the run of the ring circuit cables

• Can be of fused spur and non-fused spur.

• For non-fused spur, it must not supply more than:

a) Two single socket outlets

b) One double socket outlet

c) One stationary appliance


SPURS

• The number of spurs must not exceed the number of socket outlets in the main ring.

• For non-fused spurs, they can be connected from:

a) A socket outlet on the ring circuit.

b) A junction box connected to the ring

c) The consumer unit or DB


SPURS

Non-fused spur connected from a 13 A socket outlet


SPURS

Non-fused spur connected from a junction box


SPURS

Non-fused spur from a distribution board


Example of Spurs connection





1. INTRODUCTION




5. TYPES OF CIRCUIT

6. SPURS



TESTING OF SOCKET OUTLET

• To ensure that the equipment is up to its relevant standard.

• To ensure the equipment is not damaged and accidents due to faulty equipment can be avoided.



• Electrical tests - live test and dead test.

• Live test – On energized equipment/connected to the supply

– Involved in circuit ratings and parameters(e.g current, voltage and power)

• Dead test – Before the equipment connected to the supply

– Checks for the integrity of the circuit( e.g continuity test)



• Power socket outlet tests are:

a) Continuity test (dead test)

b) Polarity test (live test)


CONTINUITY TEST

• is a dead test

• to check the integrity of all conductors, including the earth continuity conductor.

• to ensure if there is a path between two points.


CONTINUITY TEST

Equipment Good continuity Bad continuity

(Open circuit)

Ohmmeter Low reading of ohm

(0 ~ 1 ohm)

High reading of ohm

(~ M ohm)

Buzzer tester Sound is produced No sound produced

Lamp tester Light is produced No light or a very dim

light is produced.


CONTINUITY TEST

A typical multimeter, with ohmmeter and buzzer tester

A typical lamp continuity tester.


RADIAL CIRCUIT CONTINUITY TEST

• Turn off the main supply • Identify the circuit breaker or fuse for the socket

outlet circuit. • Connect the outgoing live conductor with a

temporary link using a small cable to the neutral terminal block inside the installation’s DB.

• Connect one of the test probes to the live terminal of the tested socket, and the other to the neutral terminal of the socket.

• Repeat the tests for neutral-earth terminals and live-earth terminals.


RADIAL CIRCUIT CONTINUITY TEST

Radial circuit continuity test using an ohmmeter


RING CIRCUIT CONTINUITY TEST

Method 1 • Turn off the main supply. • Identify the circuit breaker or fuse for the socket

outlet circuit. • Disconnect and separate the live conductors for

the socket outlet circuit. • Using the appropriate tester, test the continuity

between the two conductors. • Repeat the test for neutral and earth conductors

for the socket outlet circuit.



Method 1 for ring circuit continuity test



Method 2 • Turn off the main supply. • Identify the circuit breaker or fuse for the socket outlet

circuit. • Disconnect and separate the live and neutral conductors for

the socket outlet circuit. • Cross connect the conductors. • Using the appropriate tester, test the continuity between

the live and neutral phase at each socket outlets. • Repeat the test for other conductors for the socket outlet

circuit.



Method 2 for ring circuit continuity test


POLARITY TEST

• Live test

• To verify the connections of the conductor connected to the equipment.

• For socket outlet - to ensure the terminals are connected to the correct conductors to avoid accidents.

• Using a socket outlet tester, or a voltmeter,


POLARITY TEST – SOCKET OUTLET TESTER

• Ensure the power is supplied to the socket outlet circuits.

• Connect the socket outlet tester to the socket.

• Turn on the switch of the socket outlet (for switched socket outlets).

• Record the observation indicated by the socket outlet tester.

• Repeat for other socket outlets.


POLARITY TEST – SOCKET OUTLET TESTER

Socket Outlet Tester


POLARITY TEST – VOLTMETER

• Ensure the power is supplied to the socket outlet circuits.

• Set the voltmeter to AC voltage range

• Connect the probes to the live and neutral terminals of the socket outlet. The voltage reading should be around 230 V ~ 240 V.

• Connect the probes to the live and earth terminals of the socket outlet. The voltage reading should be around 230 V ~ 240 V.

• Connect the probes to the earth and neutral terminals of the socket outlet. The voltage reading should be around 0 V.


POLARITY TEST – VOLTMETER

Connection of Voltmeter


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Iem 1101 Ch2 (Socket Outlet_edit)